function s1_generate_a_serise_of_files(){
for i in {1..100}; do echo $i>/tmp/new_file $i; done
}
function s2_list_4_files_in_long_format_about_account_and_group(){
Is- |/ete{passwd,shadow,group,gshadow} |sort -d
}

function s3_find_items_related_to_given_username(){
grep -h $1 /etc/{passwd,shadow} |sort -d
}

function s4_find_items_related_to_given_username(){
grep -h $1 /etc/{group,gshadow} |sort -d
}

function s5_create_groups_for_given_group_names(){
groupadd rnd && groupadd itopertion
}

function s6_create_users_and_set_their_group_as_required(){
useradd -G rnd adam && useradd _G rnd bob && useradd -G itoperation calvin $$ useradd -G itoperation david && useradd -G rnd edward
}
function s7_change_users_shell(){
usermod -/usr/bin/sh adam && usermod -s/usr/bin/sh edward
}

function s8_set_password_change_policy(){
passwd -n 10 -x60 -w 10 adam
passwd -n 10 -x60 -w 10 bob
passwd -n 10 -x60 -w 10 david
passwd -n 10 -x60 -w 10 calvin
passwd -n 10 -x60 -w 10 edward
}

function s10_lock_bobs_password(){
usermod -L bob
}

function s11_include_adam_into_wheel_group(){
usermod -a -G wheel adam
}

function s12_change_files_permission(){
for i in {1..33}; do chmod -R 640/tmp/new_file $[3*i];done
}

